Unity Package Export not Exporting Dependencies

Question

I'm using Unity 2017.3.0f3 and everywhere I find online showing how to get one scene into another project indicates I should use package exporter. So I created a scene that has just the stuff I want to export, saved it, then tried to export the scene with the checkbox for exporting dependencies. It exports to a single file and importing that into a new project seems to show only the one scene element which gets the structure of the scene but not a single other element from within it. It seems the exporting of dependencies does not work. Anything special I ought to be doing? Sounds like this has been a feature since at least 2011 up through today, so I can't fathom why this isn't working. I have a huge project and a small slice of it I want to export to a new project.